Method and system for acquiring ground water storage variation value by combining GRACE satellite

Abstract

The invention provides a method and system for acquiring a ground water storage variation value by combing a gravity recovery and climate experiment (GRACE) satellite. The method comprises: acquiring satellite data of the GRACE satellite, land water storage data, water intake and use hydrological model data and longitude and latitude information of a preset region, and computing a satellite appearance ground water storage variation value of the preset region; and acquiring analogue ground water storage variation iterative value of the preset region, and determining an analogue ground water storage variation iterative value of the preset region, which meets the preset condition, to be the ground water storage variation value according to the analogue ground water storage variation iterative value of the preset region by using the water intake and use hydrological model data as a boundary constraint condition. According to the method for acquiring the ground water storage variation value by combing the GRACE satellite, the acquired ground water storage variation value is more accurate, the spatial resolution of the ground water variation value can be improved about 50 times, and the inversion error of the ground water storage variation value is controlled within 10%.

Description

technical field [0001] The invention relates to the technical field of satellite meteorological data, in particular to a method and a system for acquiring groundwater storage variation values ​​in conjunction with gravity satellites. Background technique [0002] Over the past century, agricultural irrigation has consumed more than 90% of the world's freshwater resources, and globally, 40% of agricultural irrigation water comes from groundwater. The monitoring and management of groundwater resources is especially important for areas that rely on groundwater for agricultural irrigation, areas that rely on groundwater for industrial, domestic and municipal water use, especially for arid and semi-arid regions around the world. And with the rapid development of population growth and urbanization, the degree of human exploitation of groundwater is constantly increasing, and the recovery of groundwater resources, especially deep groundwater, takes a long time, that is, within a ce...

AI Technical Summary

Problems solved by technology

[0007] Based on this, it is necessary to address the problem of low accuracy of groundwater storage change values ​​retrieved by gravity satellites, and provide a method and system for obtaining groundwater storage change values ​​in conjunction with gravity satellites, wherein the method includes:

Images